I recently switched machines to a Lenovo Thinkpad X201 and have the same problem. I have the same problem using Crossover and their support team pointed to the same driver bug.
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KendorMar 9 '11 at 12:40

Reverting to an older driver is not really practical (it's possible but it's a very manual process). That bug report suggests a registry work-around. Either browse to the right location in regedit or save this as a .reg file and run it through regedit

I can verify that registry key mod does eliminate the black artifacts in O2007; however, it introduces other issues. I lost the close,minimize,maximize buttons, but also the Office 2007 button... my reaction is that this fix is not usable.
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KendorMar 9 '11 at 17:35

Kendor is right, this registry hack doesn't work well at all for Office 2007.
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RedandwhiteMar 18 '11 at 13:24